Filter.



No. 657,513. I Patented Sept. 4, I900.

J. DAVIS.

FILTER.

(Application filed Feb. 26, 1900.) (N H d I.)

ivrrn S'ra'rns I PATENT "Finch.

FILTER.

. 1 x i SPECIFIGATION forming part of Letters Patent No. 657,158, datedSeptember 4, 1900. Application filed February 26, 190i)- Serial No.6,587. (No model.)

To aZZ whom, it may concern.-

Be it known that I, JOHN DAVIS, acitizen of the United States, residingat Pittsburg, in the county of Allegheny and State of Pennsylvania, haveinvented certain new and useful Improvements in Filters; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappert-ains to make and use the same.

My invention relates to filters, has especial reference to that class offilters known as Pasteur, or porous-wall filters, has for its object theremoval of the accumulated impurities from the filtering body and thebottom of the water-receiving chamber, and consists in certainimprovements in construction which will be fully disclosed in thefollowing specification and claims.

In the accompanying drawings, which form part of this specification,Figure 1 represents a vertical transverse section of a filter, showin gpart of the filtering-cylinder broken away; and Fig. 2, a horizontalsection on line x 00, Fig. 1.

Reference being had to the drawings and the letters thereon, A indicatesthe casing of the filter; I), the bottom, having an annular channel otoreceive the lower end of the filtering-cylinder C, the upper end ofwhich is contained in a like channel I) in the plate or disk 0, whichforms the upper end of the filtered-water or storage chamber CZ withinthe filtering-cylinder O and is secured in position on the cylinder C byrods or bolts 6, which extend through said plate and screw into thebottom B. The casing is provided with a detachable cover D, to which isattached a supply-pipe f, and the water is discharged into the annularwater-receiving chamber g, and the dirty water, with the impuritiesprecipitated in chamber g and accumulated on the outer surface of thecylinder 0, after having been removed therefrom are discharged throughthe outlet or discharge pipe h in the bottom of the filter. The filteredwater is discharged from the storage-chamber (Z through pipe i, also inthe bottom of the filter. The several pipes f, h, and t' are suppliedwith suitable valves (not shown) for controlling the supply anddischarge of water. The water passes from the chamber g through theporous cylinder 0 into the chamber d, and the impurities which are notprecipitated to the bottom of the chamber g accumulate on the outersurface of the cylinder 0 and must be forcibly removed therefrorn', andto efi'ect the removal of said impurities I employ a cleaning deviceconstructed as follows:

Upon the boss of the plate 0 restsaliori zontal bar Z, to one end ofwhich is attached on each side a short spiral spring Z, and to each ofthese springs is attached a spiral metallic flexible strip wt,preferably lined on the side next to the cylinder with durable material(not shown) suitable to remove the impurities which adhere to 'itssurface. These flexible spiral strips diverge in opposite directions,extending downward and half-Way around the cylinder 0 to the oppositeside from which they start, and lie just close enough to the cylinder toremove all accumulated impurities and yet not produce unnecessaryfriction, and at their lower ends said flexible strips are attached to ahorizontal brush E, designed to remove the sediment, the result ofprecipitation, and the mud and other impurities detached from thecylinder 0 from the bottom of the chamber g and discharge the ,samethrough pipe h, The brush E is also connected to the bar Zby a verticalrod n, Whose upper end is secured to the end thereof opposite to the endto which the scrapers are secured.

F indicates an air-supply pipe provided with a valve 0, controlledbyafloat 0, to admit air to the storage-chamber d.

In the use of the filter the scrapers and the brush are rotated by meansof the crank 17, connected to one end of the shaft q, which engages thebar l and rests in the boss 7c, and the watersupplied from theservice-pipe and pipe f is allowed to pass through the chamber 9 untilthe impurities have been discharged through pipe h and the water flowsfree from perceptible impurities.

Having thus fully described my invention,

what I claim is 1. A filter having a cylindrical filteringbody, anannular water-chamber, and a concentric water-chamber within thefilteringbod y; in combination with scrapers surrounding thefiltering-body, extending from the ICO upper to the lower end thereof,and a device for cleaning the bottom of the annular chamber andconnected to the scrapers.

2. A filter having a cylindrical filteringbody, an annularwater-chamber, and a water-storage chamber within the filtering-body; incombination with spirally-arranged scrapers connected at their upper andlower ends and extending half-way around said body in 10 oppositedirections from the upper to the lower end, and a brush engaging thebottoni of said annular chamber and connected to the lower ends of saidscrapers.

In testimony whereof I affix my signature in presence of two witnesses.

I JOHN DAVIS. Witnesses:

EDW. A. Bass, '1. A. MCNARY.

